Mortgages guide
How a Down Payment Changes Mortgage Cost
A down payment reduces the amount borrowed for a home purchase and usually lowers principal-and-interest payments for otherwise identical loan terms. It also requires more cash upfront. The effect on mortgage insurance, rate, and total costs depends on the loan program and lender terms.
Calculate the starting loan amount
A simplified starting estimate is loan amount = purchase price − down payment. If a home costs $350,000 and the down payment is $70,000, the base loan amount is $280,000 before any financed charges or contract adjustments. Closing costs are separate unless included in the financing.
Compare payment scenarios
Assume a $350,000 purchase, 30-year fixed term, and hypothetical 6.5% nominal APR, excluding fees and mortgage insurance. A $70,000 down payment leaves $280,000 borrowed and about $1,769.79 monthly principal and interest. A $35,000 down payment leaves $315,000 and about $1,991.01. The $35,000 smaller down payment raises modeled principal-and-interest by about $221.22 monthly.
Include cash and mortgage insurance
A larger down payment means more cash is tied up at purchase; preserve funds for closing costs, moving, repairs, and emergencies. A smaller down payment may trigger mortgage insurance or different program terms. Requirements vary, and mortgage insurance premiums can be structured differently. Use a Loan Estimate to compare real offers.
Down payment is only one input
The rate, loan term, property taxes, homeowners insurance, HOA dues, and lender fees also shape the cost. A larger down payment does not automatically make a home affordable, and a smaller one does not by itself determine approval. Compare the full monthly housing cost and cash to close for each scenario.
Evaluate the tradeoff
Try more than one down-payment amount while holding other assumptions steady, then compare loan balance, payment, interest, mortgage insurance, and remaining savings. Ask the lender how points, credits, and program rules change the offer. Decide using your full budget and documented terms rather than a percentage rule alone.
| Down payment | Starting loan amount | Monthly payment |
|---|---|---|
| $70,000 | $280,000 | $1,769.79 |
| $35,000 | $315,000 | $1,991.01 |
Frequently asked questions
Does a larger down payment always remove mortgage insurance?
No. Requirements depend on loan type, terms, and applicable rules.
Should I use all savings for a down payment?
Consider closing costs, emergency reserves, repairs, and other near-term obligations before deciding.
Sources and further reading
Try the calculator
Use the Home Affordability Calculator to explore your own numbers with the assumptions shown in the tool.
Related guides
Educational content only; not individualized financial, tax, or legal advice.